This article presents a focused comparative analysis of the institutionalization of two governance practices in the European Commission that levy distinct challenges to the gender status quo: gender mainstreaming (which overtly challenges gender bias) and evaluation (which does not have explicit feminist aspirations). With reference to five dimensions, we identify evaluation as relatively strongly institutionalized, and gender mainstreaming as relatively weakly institutionalized. We draw on the explanatory power of feminist institutionalism to unpack these findings, arguing that a feminist institutional perspective can shed light on this variation, as it provides greater insight into the formal and informal institutions that constrain, enab...